[pianotech] Capo Bar

[Tony Caught]

Don, Joe,

 

Thanks heaps.

 

This piano I resrung about 10 years ago Serial No. 3750200. Yes I did file
the capo bar down at the time, now I am getting that buzzing noise from
about E6 up. I loosened a few strings and felt the grooves in the bar,
seemed to be quite deep. Put tension back on then moved the three strings on
a bad note from side to side and found that this fixed the problem.
Temporally anyway. I am guessing that the bar was not hardened originally
and am trying to find out if you can treat the bar without the expense of a
bebuild.

 

Joe, the last time I looked at my saved emails it was over 4 gig. I shall
have to sort them out one day.

 

Tony

 

Tony Caught

acaught at internode.on.net

0427 850 737

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Joe DeFazio
Sent: Thursday, 30 June 2011 2:55 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Capo Bar

 

>From Tony Caught, Wednesday, June 29, 2011 2:39 AM

How do you harden the capo bar in a grand piano.

Have a Yamaha CF that is buzzing wildly in the upper treble. I am going to
release the tension on the strings in the upper section then seesaw some
emery paper over the grooves to get the bar smooth but this bar is IMO to
soft. Can this be chemically treated to harden it or how should it be done.

 

Tony

 

Hi Tony,

 

I have never hardened a capo bar, but the case hardening via of metal is a
fairly well-understood phenomenon.  The Wikipedia page (case hardening) has
some info to get you started.  I saved the following long Pianotech thread
from Ron Overs and several others a few years ago.  I think it might be of
some use to you.  My apologies for the length of this email, but I thought
that the whole thread should be preserved, and I didn't want to pre-decide
which parts you might find to be the most useful.

 

Joe DeFazio

Pittsburgh

 

 

 

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